EP0209328A2 - Schneckenextruder - Google Patents

Schneckenextruder Download PDF

Info

Publication number
EP0209328A2
EP0209328A2 EP86305326A EP86305326A EP0209328A2 EP 0209328 A2 EP0209328 A2 EP 0209328A2 EP 86305326 A EP86305326 A EP 86305326A EP 86305326 A EP86305326 A EP 86305326A EP 0209328 A2 EP0209328 A2 EP 0209328A2
Authority
EP
European Patent Office
Prior art keywords
flights
screw
annular zone
chamber
extruder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86305326A
Other languages
English (en)
French (fr)
Other versions
EP0209328A3 (de
Inventor
Kenneth Wood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Farrel Corp
Original Assignee
Farrel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Farrel Corp filed Critical Farrel Corp
Publication of EP0209328A2 publication Critical patent/EP0209328A2/de
Publication of EP0209328A3 publication Critical patent/EP0209328A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/687—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having projections with a short length in the barrel direction, e.g. pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/565—Screws having projections other than the thread, e.g. pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/422—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix with screw sections co-operating, e.g. intermeshing, with elements on the wall of the surrounding casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • This invention is concerned with screw extruders, especially screw extruders suitable for use in processing thermoplastics or elastomeric materials.
  • UK patent specification number 1 440 682 describes an extruder for homogenising viscous materials e.g. rubber materials, in which a screw rotatable in the melt chamber has interrupted helical flights, with obstacles projecting from the sides of the chamber arranged to cooperate with the flights of the screw.
  • extruders as described in these three specifications provide significant improvement in mixing and homogenization over extruders with a plain screw thread without any additional means for improving homogenization and mixing, nevertheless mixing and homogenization can be yet further improved.
  • One of the objects of the present invention is to provide an improved screw extruder.
  • a screw extruder embodying the invention comprises a barrel having a melt chamber extending therethrough, a screw mounted for rotation in the melt chamber and comprising a plurality of helical flights with channels therebetween, and at least one set of projections projecting from the barrel towards an axis of rotation of the screw into an annular zone of the melt chamber (around a core of the screw) and interrupting the flights of the screw.
  • the projections may comprise a number of so-called pegs or pins set in the wall of the barrel or mounted for movement inwardly and outwardly of the melt chamber towards and away from the axis of rotation of the screw so that the projections may project a desired distance into the melt chamber to give the desired processing to material being extruded.
  • a screw extruder according to the invention may comprise one or more annular zones formed by projections from the barrel, dividing the screw into two or more sections. Material is preferably fed to the chamber through an opening in the barrel wall at an inlet end portion of the extruder; the screw at the inlet end portion comprises uninterrupted screw flights, the, or the first, annular zone being positioned downstream of the inlet end portion of the extruder.
  • annular zones may be positioned at any desired portion of the extruder downstream of the feed zone; however, preferably a sufficient length of extruder screw is positioned downstream of the final annular zone to generate a substantially steady discharge from the extruder.
  • the screw flights of an extruder according to the invention may be displaced, at either side of the or each annular zone angularly relative to one another so that the screw flights at either side of the (or each) annular zone are staggered.
  • the flights at either side of an annular zone are so disposed that, were the flights from one side of the annular zone to be continued at the other side of the annular zone, the screw flight at that other side of the annular zone would lie substantially centrally of the channel formed between the two continued flights.
  • the construction and arrangement of an extruder embodying the invention may be such that end portions of adjacent flights at either side of an annular zone overlap one another considered in a direction longitudinally of the screw parallel with its axis.
  • each flight terminates at its adjacent annular zone in an end face lying in a plane substantially at right angles to the axis of rotation of the screw and said faces of adjacent flights at either side of an annular zone are disposed so that they do not face one another, the faces being displaced angularly, relative to one another, round the axis of the screw so that end portions of the helical flights overlap one another when considered in a direction parallel with the screw axis.
  • the end faces of each flight at either side of an annular zone are positioned so that, considered in a direction parallel with the screw axis, each end face is at least partially and preferably wholly opposite a helical face of a screw flight at the opposite side of the annular zone.
  • Material flowing along the channels between the flights in the operation of an extruder according to the invention will be subjected to shear, inter alia, between the end portion of the flights adjacent the annular zones and the projections.
  • the amount of angular displacement of the sets of flights at either side of an annular zone may, together with the helix angle, effect the amount of shear to which the material is subjected.
  • the angular displacement of the flights at either side of an annular zone relative to one another results in flow of material along the screw being divided as the material crosses the.annular zone thus increasing the multi-layering of the material leading to reduced temperature variation and better homogeneity of the material.
  • the illustrative screw extruder comprises a barrel 10 in which is formed a cylindrical extrusion chamber 12 extending lengthwise through the barrel.
  • An extruder screw 14 is mounted for rotation in the chamber 12 about an axis A.
  • the screw 14 is arranged to be rotated in the operation of the machine by suitable drive gear 16 of known construction.
  • Material to be processed is supplied to an inlet end portion of the chamber 12 of the extruder through a feed opening 18. Material is fed, by rotation of the screw 14 in the direction indicated by arrows B, along the extrusion chamber 12 and is discharged from the chamber 12 through an outlet opening (not shown) adjacent an outlet end portion 20 of the screw.
  • the extruder screw 14 comprises two flights 26,28 spaced apart to leave two channels of equal width therebetween; the flights 26,28 may be regarded as primary flights of the extruder.
  • the flights 26,28 commence at the inlet end portion of the screw 14 and continue at the outlet end portion of the extruder.
  • the illustrative screw extruder also comprises at least one set, namely ten sets, of projections in the form of pins 22 projecting from the barrel 10 towards the axis of rotation A of the screw 14.
  • Each set of pins 22 consists of 6 pins equally spaced round the barrel 10 defining an annular zone 24 of the extrusion chamber interrupting flights 26,28 of the screw.
  • each of the annular zones 24 to the flights 26,28 are flights 30,32 which are displaced angularly relative to the flights 26,28 so that the screw flights 26,28 and 30,32 at either side of each of the annular zones 24 are staggered with respect to one another.
  • the construction and arrangement is such that end portions of the flights 26,28 at one side of each annular zone 24 overlap end portions of adjacent flights 30,32 at the opposite side of the zone 24.
  • the flights 30,32 are equally spaced apart and displaced angularly relative to the flights 26,28 through an angle of 90° from the position which would have been occupied by the flights 26,28 were these to have been continued through the sections including the flights 30,32. This places the flights 30, 32 at substantially the centre of the channels between the flights 26,28 were these flights to have been continued through the section including flights 30, 32. Likewise, at the recommencement of the flights 26,28 downstream of the section including flights 30,32, the recommencement of the flights 26,28 will be at substantially the centre of the channels between the flights 30, 32 were these flights to have been continued downstream.
  • the flights 26,28 can be considered as continuing throughout the whole length of the extruder, apart from the interruptions mentioned above, in extruders according to the invention, the flights at the outlet end portion 20 of the screw 14 may be angularly displaced from the position which the flights 26, 28 (starting at the inlet end portion of the screw) would occupy were they to be continued through the length of the screw.
  • each annular zone 24 may be angularly displaced through an angle other than 90° suitably between 65° and 115° from the position which would be occupied were the flights at the upstream side of the annular zone to be continued downstream, although the preferred angular displacement is such as to position the downstream flights substantially at the centre of the channels between the upstream flights were these upstream flights to have been continued downstream of the appropriate annular zone.
  • the screw comprises two flights along the whole of its length
  • the screw may comprise one or more sections, at one side or another of one of the annular zones 24, having three or four flights equally spaced apart and angularly displaced from the two flights at the other side of the appropriate annular zone 24.
  • the screw 14 of the illustrative extruder comprises two flights throughout the whole of its length extruders according to the invention may comprise three or four or even more flights or, in some circumstances only one screw flight, for the bulk of its length.
  • a screw comprises three flights at either side of a zone 24 the flights are suitably displaced angularly by about 60°, in a screw comprising four flights an angular displacement of about 45° is preferred an angular displacement of about 180° is preferred in a single flight screw: in all cases the downstream flights are positioned substantially centrally between the positions which the upstream flights would have occupied were they to have been continued downstream of the annular zone.
  • the angular displacement may vary by up to about 28% from the preferred displacement, in which the operation of the extruder is best balanced.
  • the larger diameter extruders have a greater material capacity and increasing the number of staggered flights ensures that the material is subjected to the same division and working as material in smaller diameter extruders with fewer flights.
  • the screw of an extruder embodying the invention may comprise different numbers of flights at different parts of its length or the same number of flights along its whole length.
  • the ratio of length to diameter of the extruder screw and the lead of the flights at various parts of the screw together with the number of annular zones provided are selected according to the application for which it is desired to use the extruder.
  • a screw having a threaded portion of length of about 147cm and outside diameter about 9cm having a length to diameter ratio of about 16.5 to 1 may suitably have eight to twelve, preferably 10 annular zones provided by sets of pegs.
  • annular zones 24 Five or more are annular zones 24 wherein the flights at either side of the annular zones 24 are displaced angularly relative to one another as hereinbefore described and the remainder of the annular zones may be annular zones 25 in which the flights at either side of the annular zones 25 are aligned and not displaced angularly relative to one another.
  • the material is also preferred to subject the material to a slight compression in the inlet end portion of the extruder before reaching the first annular zone, for example by changing the lead of the screw.
  • Annular zones 24 and annular zones 25 may be disposed in any convenient relation and number dependent upon the processing to be carried out; of course, in screw extruders otherwise similar to the illustrative extruder, all of the annular zones may comprise annular zones 24 in which the flights at either side of the zone are displaced angularly relative to one another. It is preferred, where the screw comprises both annular zones 24 and annular zones 25, that an annular zone 25 is disposed closest to the inlet 18, preferably several annular zones 25 being first encountered by the material as it travels through the extruder so that the material is softened and partially processed before being subjected to the more severe action upon crossing the zones 24.
  • the screw 14 is rotated in the chamber 12 relative to the barrel 10, by the drive gear 16 at a suitable speed in the directions indicated by the arrows B in the drawings.
  • Material to be processed is supplied by suitable feed means (not shown) through the feed opening 18 into the extrusion chamber 12 at the inlet end portion thereof and the material supplied through the opening 18 is fed downstream (to the left viewing Figures 1 and 2) by rotation of the screw.
  • suitable feed means not shown
  • the flow of material along the channels between the flights 26,28 encounters the pins 22 of the first of the annular zones 24 which cause considerable turbulence and mixing of the materials.
  • the material in each of the channels between the flights 26,28 is caused to divide as it meets the edges 44 and enters the screw channels between the screws 30, 32 (which as will be appreciated are staggered relative to the channels upstream of the annular zone 24).
  • the arrows C generally indicate flow of material along the channels between the flights 26,28 and 30,32. As can be seen from Figure 2 the flows along the various channels are divided as material crosses each annular zone 24. Note that, in Figure 2, the flights 26 and 32 are shown twice so that both of the channels between the flights 26,28 and 30,32 can be seen.
  • the pins 22 also pass between these converging gaps formed between the faces 34,38 and 35,39; 36,40 and 37,41 when passing through the converging gap around the pins 20 the material is subjected to considerable shearing action as well as the turbulence created by the pins 22.
  • the amount of shear to which the material is subjected when passing through these converging gaps is dependent, inter alia, upon the amount of overlap between the upstream and downstream end portions of adjacent flights, the helix angle of the flights, the width of the annular zone and the dimensions of the pins 22.
  • the pins 22 of the illustrative extruder are circular in cross-section, pins of different shapes may be used if desired.
  • the upstream end faces of the flights at the downstream side of each annular zone 24,25 lie in planes which are at right angles to the axis A of rotation of the screw 14 and which converge with the helical leading faces of the flights e.g. as can be seen from Figure 2, the end face 34 converges with the helical leading face 40, the faces meeting in a sharp edge 44 which divides the flow as indicated by arrows C.
  • the downstream ends of the flights at the upstream side of the annular zones 24,25 also each terminate in a face 42 inclined to the helical main trailing faces of the flight and which is at right angles to the axis A of rotation of the screw.
  • the annular zones 24,25 can be regarded as being defined by the faces 34,42;35,42;36,42,3.7,42.
  • the number of pins in each set in a machine in accordance with the invention is chosen according to the degree of mixing which is desired of the particular material in question; normally, more pins are used in each set for the larger diameter screws than for the smaller ones. In the 147cm screw described above 6 pins are preferred in each set.
  • each annular zone 24 Because of the relative positioning of flights at either side of each annular zone 24 material which avoids being subjected to substantial shear by passing through a converging space between one of the end faces 34,35,36,37 and the corresponding leading face 38,39,40,41 will enter the channel at the downstream side of an annular zone 24 fairly close to the leading face 38,39,40,41 of the flight at the downstream side of the annular zone and will therefore have a high probability of being subjected to shear between the converging faces when approaching the next annular zone 24 downstream.
  • material close to the leading face of each flight 26,28,30,32 will, on passing through the annular zone 24 become situated close to the trailing face of the subsequent downstream flight thus improving uniformity of work done on the material, resulting in uniform temperature.
  • material adjacent the leading face 40, upstream of a zone 24 will be close to the trailing face 43 of a flight at the downstream side of the zone 24.
  • Material extruded by the illustrative screw extruder may be of improved quality having reduced temperature variations through the material and better homogeneity than materials processed in the previously known extruders.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP86305326A 1985-07-16 1986-07-11 Schneckenextruder Withdrawn EP0209328A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8517864 1985-07-16
GB8517864A GB2178691B (en) 1985-07-16 1985-07-16 Screw extruders

Publications (2)

Publication Number Publication Date
EP0209328A2 true EP0209328A2 (de) 1987-01-21
EP0209328A3 EP0209328A3 (de) 1988-06-01

Family

ID=10582327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305326A Withdrawn EP0209328A3 (de) 1985-07-16 1986-07-11 Schneckenextruder

Country Status (7)

Country Link
US (1) US4720254A (de)
EP (1) EP0209328A3 (de)
JP (1) JPS6219427A (de)
AU (1) AU582069B2 (de)
BR (1) BR8603535A (de)
CA (1) CA1251906A (de)
GB (1) GB2178691B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114703A1 (de) * 2016-12-21 2018-06-28 Basf Se Einwellenextruder und verwendung eines einwellenextruders sowie verfahren zum ändern einer morphologie eines superabsorbierenden polymergels mit einem einwellenextruder

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5304054A (en) * 1991-04-19 1994-04-19 Frenkel C-D Aktiengesellschaft Plasticizing sections of cold feed rubber extruders
AT398937B (de) * 1992-06-12 1995-02-27 Erema Vorrichtung zum plastifizieren von thermoplastischem kunststoffgut
US5975449A (en) * 1997-05-19 1999-11-02 Geyer; Paul Extrusion micro-mixing
US5961209A (en) * 1997-06-11 1999-10-05 Royal Feed Screws, Inc. Feed screw
DE19749504A1 (de) * 1997-11-08 1999-05-12 Krupp Ag Hoesch Krupp Schneckenextruder
US6808380B1 (en) 2000-05-26 2004-10-26 Gma Co., Ltd. Hardness taper tube and production method and device therefor
US20050236734A1 (en) * 2004-04-22 2005-10-27 Rauwendaal Extrusion Engineering, Inc. Screw extruder and extruder screw for improved heat transfer
JP4338668B2 (ja) * 2005-04-05 2009-10-07 住友ゴム工業株式会社 ゴム押出機
SI1815958T1 (sl) * 2006-02-06 2009-04-30 Buss Ag Mešalni in gnetilni stroj
US9295992B2 (en) * 2012-06-13 2016-03-29 Recycled Asphalt Shingle Technology, Llc Horizontal mixer
ES2880393T3 (es) * 2017-10-17 2021-11-24 Buss Ag Arbol de tornillo sin fin asimétrico de dos alas para una máquina de mezclado y amasado

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838794A (en) * 1957-04-08 1958-06-17 Du Pont Extrusion apparatus
US3023455A (en) * 1959-03-09 1962-03-06 Herbert F Geier Mixers
CH420580A (de) * 1965-02-08 1966-09-15 Buss Ag Einrichtung zum Entgasen von plastischen Massen in Schneckenmaschinen
DE1302096B (de) * 1965-03-18 1969-12-18 Reifenhaeuser Kg Schneckenpresse
US3487503A (en) * 1967-06-28 1970-01-06 Midland Ross Corp Auger-type extruder
US3814563A (en) * 1969-02-25 1974-06-04 French Oil Mill Machinery Apparatus for treating elastomeric materials
DE2124466B2 (de) * 1971-05-17 1978-09-28 Fried. Krupp Gmbh, 4300 Essen Extruder fur die Verarbeitung von Kunststoffen und Elastomeren
US3981658A (en) * 1972-01-14 1976-09-21 International Basic Economy Corporation Screw type apparatus for drying moist polymeric materials
US4178104A (en) * 1972-07-21 1979-12-11 Uniroyal, Ag Method and apparatus for mixing viscous materials
DE2235784C3 (de) * 1972-07-21 1986-01-09 Uniroyal Englebert Reifen GmbH, 5100 Aachen Einschnecken-Extruder zum Mischen und Homogenisieren von hochviskosen Kautschukmischungen und hochviskosen Thermoplasten
DE2257007C3 (de) * 1972-11-21 1984-11-08 Krauss-Maffei AG, 8000 München Eingängige Schnecke für Ein- und Mehrfachschnecken-Pumpen und -Pressen
US3884451A (en) * 1973-01-17 1975-05-20 Exxon Research Engineering Co Mixing apparatus and method
AU520034B2 (en) * 1977-05-26 1982-01-14 Globe Roof Tile Machines Pty. Ltd. Mixing apparatus
DE2907074C2 (de) * 1979-02-23 1982-08-19 Dynamit Nobel Ag, 5210 Troisdorf Schneckenextruder für Polyvinylidenfluoridmonofile
DE3003615C2 (de) * 1980-02-01 1984-03-29 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Schneckenstrangpresse mit Stiftzylinder
US4304054A (en) * 1980-04-21 1981-12-08 The B. F. Goodrich Company Screw press for drying elastomeric polymers
DE3043194A1 (de) * 1980-11-15 1982-07-01 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Einrichtung zum mechanischen trennen von fluessigkeiten aus fluessigkeitsfeststoffgemischen in einer schneckenpresse
DE3134479C2 (de) * 1981-09-01 1988-12-22 Josef A. 7144 Asperg Blach Vorrichtung zum kontinuierlichen Aufschmelzen und Mischen von Kunststoffen
GB2150037B (en) * 1983-11-26 1986-11-12 Farrel Bridge Ltd Extruder barrel construction
US4629327A (en) * 1985-01-29 1986-12-16 Hermann Berstorff Maschinenbau Gmbh Pin-barrel extruder having adjustable pins
DE3506424C1 (de) * 1985-02-23 1986-08-21 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Stiftverstelleinrichtung an einem Stiftextruder fuer die Verarbeitung von Kautschuk oder thermoplastischen Kunststoffen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114703A1 (de) * 2016-12-21 2018-06-28 Basf Se Einwellenextruder und verwendung eines einwellenextruders sowie verfahren zum ändern einer morphologie eines superabsorbierenden polymergels mit einem einwellenextruder
CN110300650A (zh) * 2016-12-21 2019-10-01 巴斯夫欧洲公司 单轴挤出机和单轴挤出机的用途，以及使用单轴挤出机改变超吸水性聚合物凝胶的形态的方法
US11458665B2 (en) 2016-12-21 2022-10-04 Basf Se Single-shaft extruder and use of a single-shaft extruder, and method for altering morphology of a superabsorbent polymer gel using a single-shaft extruder

Also Published As

Publication number Publication date
GB8517864D0 (en) 1985-08-21
US4720254A (en) 1988-01-19
BR8603535A (pt) 1987-03-04
EP0209328A3 (de) 1988-06-01
GB2178691B (en) 1989-10-25
AU582069B2 (en) 1989-03-09
AU6017586A (en) 1987-01-22
GB2178691A (en) 1987-02-18
JPS6219427A (ja) 1987-01-28
CA1251906A (en) 1989-04-04

Similar Documents

Publication Publication Date Title
US5147198A (en) High performance extruder with a constant number of threads in the inlet and outlet regions of a transfer shearing section
US4720254A (en) Screw extruders
US3701512A (en) Screw extruder for processing thermoplastic materials
US4824256A (en) Co-rotating twin-screw kneaders with kneading disks
US4697928A (en) Modular mixing apparatus including interchangeable fluid processing means
US4848920A (en) Static mixer
US4900156A (en) Twin screw extruder with thread-free mixing zones
SU1189329A3 (ru) Устройство дл формовани термопластичных и/или эластомерных масс
EP1526959B1 (de) Extruder zum kontinuierlichen bearbeiten und/oder verarbeiten von fliessfähigen materialien
US4749279A (en) Modular mixing apparatus for extruded material including rotary for processing modules having variable speed independent drive means
US7270471B2 (en) Extruder
US20040141405A1 (en) Homogenizing and/or dispersing device comprising endless screws
US4447156A (en) Modular mixing apparatus including interchangeable fluid processing means
US4075712A (en) Extrusion and mixing apparatus
US3957256A (en) Screw extruder
US4201482A (en) Perforated mixing elements for static and dynamic mixers
EP1194278A1 (de) Einschnecken-extruder
US4872761A (en) Extrusion apparatus
US5599098A (en) Extruder screw with multiple flighting
JPH0233410B2 (de)
CN1075435C (zh) 可塑材料的多螺纹轴连续操作混合机
US3897937A (en) Extruder screw
CN113492513B (zh) 一种双螺杆挤出元件及双螺杆挤出机
CA2057603C (en) Extruder for poorly miscible extrudates
US20170297227A1 (en) Extruder Screw

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE FR IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE FR IT SE

17P Request for examination filed

Effective date: 19881109

17Q First examination report despatched

Effective date: 19890629

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19891113

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WOOD, KENNETH